Boiler and tank spud



I A. G. SUTTILL.

BOILER AND TANK SPUD.

APPLICATION FILED SEPT. 9. 1919.

1,360,815, Patented NOV. 30, 1920.

' B W jz 3 flbe/vf. Sufi/ll UNITED STATES PATENT OFFICE.

ALBERT G. SUTTILL, OF WATERTO'WN, MASSACHUSETTS, ASSIGNOR TO RIVERSIDEBOILER WORKS, INC., OF CAMBRIDGE, MASSACHUSETTS, A CORPORATION OFMASSACHUSETTS.

BOILER AND TANK SPUD.

Application filed September 9, 1919. Serial No. 322,740.

To all whom it may concern:

Be it known that I, ALBERT G. SUTTILL, who have taken out my firstpapers of citizenship in the United States, residing at Watertown, inthe county of Middlesex and State of Massachusetts, have invented newand useful Improvemenets in Boiler and Tank Spuds, of which thefollowing is a. specification.

The present invention relates to boiler and tank manufacture, and hasmore particular reference to the structure and installation of spudsused for subsequently tapping or connecting pipes or the like in theboiler or tank.

An object of this invention is to so construct and install a spud in atank or boiler as to offset leakage and displacement of the spud in theboiler plate during the tapping or threading of the spud and during thescrewing of a pipe or the like into the spud, which tapping and securingof the pipe in the spud is done after the spud has been secured orinstalled in the tank or boiler.

Another object of the invention resides in so constructing andpositioning a spud in the boiler plate as to have all of the advantagesderived from a welded boss, which is sometimes used but which hasdisadvantages in the manufacture of the boilers and tanks. I

' The above, and various other, objects and advantages of this inventionwill be in part described in, and in part understood from,

the following detailed description of one embodiment of the invention,the same being illustrated in the accompanying drawings, wherein- Figurel is an end elevation of a spud constructed according to the presentinvention.

Fig. 2 is a side elevation of the same.

Fig. 3 is a longitudinal section taken through the spud as applied to aboiler plate and prior to being set.

Fig. 4 is a similar view showing the spud set and after the same hasbeen tapped and a portion of pipe secured therein.

Fig. 5 is a transverse section taken on the line 55 of Fig. 4 andshowing the polygonal opening in the boiler plate to receive the spud.

Referring to the drawing, wherein like parts are designated by similarnumerals of reference throughout the several views, 10 designates theshoulder, flange or head of a spud which is provided with a shank 11 ex-I tral opening 12 therethrough which is of substantially the desireddiameter and which is usually unthreaded. The inner end of the shank 11has a flared inner wall 13 which forms a flaring end to the opening 12and presents an inclined annular face facilitating the swaging orupsetting of theinner end of the shank as will be hereinafter pointedout.

That portion of the shank 11 adjacent to the shoulder 10 is provided, inthe present embodiment, with a plurality of projections of angularformation which provide angularly-disposed faces which extend from theshoulder 10 and which are ofa width equal substantially to the thicknessof the boiler plate, through which the shank 11 is adapted to extend. Asshown in the drawing these angularly-disposed faces are designated at14.

For the purpose of installing the spud according to this invention theboiler plate 15 is provided with a polygonal opening corresponding inshape to the cross section of the shank 11 at that portion thereof uponwhich the fiat faces 14 are formed, the faces 14: being adapted to fitsnugly-in the polygonal opening, as shownin Fig. 5 to prevent turning ofthe spud in the boiler plate.

When the spud is positioned through the boiler plate with the shoulder10, lying against one side thereof, the outer end of the shank 11 isswaged or upset by being hammered down by hand, air machine, or drophammer until a leak-proof joint is formed. This spreading andoverturning of the end of the shank is facilitated by the conicalextremity of the shank incident to the flaring wall 13 and the spud,when thus upset, is rigidly sealed in the boiler plate 15, as shown inFig. 4, and is held from turning there in even when the hole though thespud is tapped and when the pipe connection is made in the spud.

It has heretofore been found in practice with the usual form of spudthat the latter, during the tapping operation, frequently turns in theboiler plate, and that the spud also" frequently turns during thescrewing in of the threaded end of a pipe. When the spud is thus turnedunder either of these conditions, it causes the spud to become loosenedin the boiler plate to such an extent as to leak and it is diflicult, ifnot impossible,

- to stop such leakage unless the spud be reto this invention suchleakage cannot take place as the spud is locked in the boiler plate fromturning and there is no danger of dis turbing the relative positions ofthe shoulder and the'svvaged end of the spud against the opposite sidesof the boiler plate.

It is of course understood that various changes and modifications may bemade in the above specifically-described embodiment of this inventionWithout departing from the spirit thereof, such changes andmodifications being restricted only by the scope of the following claim.

What is claimed is: v

A spud for use in boilers and tanks, comprising a shouldered headadapted to lie against the face of the Wall of a boiler" or forinsertion through a polygonally formed opening in said wall of theboiler or tank,

- said shank having exterior polygonal faces corresponding to saidopening in the boiler or tank Wall and extending from said shoulderedhead and being of a Width substantially equal to the thickness of saidboiler or tank Wall and adapted to fit in the polygonal opening thereofto hold the shank from turning in the opening, the outer portion of theshank being substantially cylindrical and having an endwise flaringinner wall, the bottom of the latter being adapted to lie substantiallyin line with the surface of the boiler or tank Wall, reducing thethickness of the end of the shank, Wherebysaid reduced and cylindricallyformed end of the shank niay be easily and uniformly swaged and roundedover against the opposite face of said boiler or tank Wall. I ALBERT Gr.SUT TILL.

